GHCi: Using GHCi from a DOS box sucks. Using it from withing shell mode in Emacs sucks a lot less - do 'M-x shell' in emacs, then type 'ghci'.

GHCi on cygwin: When running GHC under a Cygwin shell on Windows, Ctrl-C sometimes doesn't work. A workaround is to use the rlwrap program to invoke ghci : In addition to proper Ctrl-C, you also get emacs (or vi) key bindings and command history across sessions, which saves you a load of typing.